Invoicing

Resources on international billing & taxation

Any resources on international billing & taxation? We have customers in several different countries and there is a lot of conflicting/confusing info on how to deal with taxes on different types of activity (i.e. saas transactions & subscriptions vs pure services). Specifically I'm looking for info on Ireland and New Zealand atm. Would love to hear from someone who also has had some experience with this from more than one angle (i.e. not just saas subscriptions, but also pure services).